Improvement in tinners  squares



' UNITED STATES PATENT OFFI E.

DAVID B. MnToALF, OF BATTLE CREEK, MICHIGAN.

IMPRCSVEMENT IN TINNERS SQUARES.

Specification forming part of Letters Patent No. 172,82 1, dated February 1, 1876 application filed 7 October 2, 1875.

To all whom it may concern:

Be it known that I, DAVID E. METGALF, of the city of Battle Creek, in the county of Calhoun and State of Michigan. have invented certain new and useful Improvements in Tinmens Squares or Rules; and do hereby declare that the following is a full, clear, and

- be hereafter described.

In order to enable others skilled in the art to make and use my invention, I will nowproceed to describe its construction and use.

Figure 1 is themattern side of the square or rule. Theline through, the angle of the square is one side of all of the patterns, the other diagonal lines are the other sides, and each line,

represents a pattern. The lines are numbered 12 3, 850. N 0.1 is a large wash-basin. No. 2 is a small water-ladle, and so on until we have a full set of tinmens patterns.

The measure-patterns marked hereon are the United States standard. The square also contains a complete set of metric-measure patterns.

Toillustrateits use Extend theline through the angle of the square indefinitely, as a b then extend the line No.38,cd, until it crosses ab at 0. Take apair ofdividers, open them upon the square nine and three-eighths inches; then place one point of the dividers upon the point e where the lines a b and c d cross, and draw the curved line fg. Set the dividers again thirteen and five-eighths inches, and draw the curved line h 0,- add the locks, represented by dotted lines, and the pattern will be com plete.

This pattern is fora six-quart pan. It takes 1 four pieces for a pan. All of the other lines are for patterns, and are worked in the same manner.

The pattern marked Fig.3 is-abou't on e-- sixth its size. I

Fig. 2 is the other side of the square or rule,

and is for cylindrical work to show its utiliunderstood to mean that a can or vessel eight and a half inches in diameter, and one inch in depth, will hold the .246 part of a gallon, or about one quart; therefore, should you desire to make a can to hold one gallon eight and a half inches in diameter, it must be fourinchesindepth.

I am aware that squares or rules havebeen made marked with diameters and circumferences; consequently I do not make claim to any have hereunto set my hand this 28th day of September, 1875.

- DAVID H. METOALF. Witnesses:

FOSTER M. METoALF,

DANIEL SQUIER. 

